<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div class="header-left">
        <img src="../assets/logo-shop.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="exit">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          router
          :collapse="isCollapse"
          :collapse-transition="false"
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.authName"
            v-for="item in menuList"
            :key="item.id"
          >
            <!-- 一级菜单的模块区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item
              :index="subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavstate(subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao',
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: '',
    }
  },
  methods: {
    exit() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) {
        // 提示错误
        return this.$message({
          duration: 2000,
          message: res.meta.msg,
          type: 'error',
        })
      }
      // 将数据放到data中
      this.menuList = res.data
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存连接的激活状态
    saveNavstate(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    },
  },
}
</script>

<style scoped>
.iconfont {
  margin-right: 10px;
}

.home-container {
  height: 100%;
}

.el-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 5px;
  background-color: #373d41;
  color: #fff;
  font-size: 20px;
}

.el-header .header-left img {
  vertical-align: middle;
}

.el-header .header-left span {
  margin-left: 20px;
}

.el-aside {
  background-color: #333744;
}

.toggle-button {
  background-color: #4a5064;
  color: #fff;
  line-height: 24px;
  text-align: center;
  font-size: 10px;
  letter-spacing: 0.2em;
  cursor: pointer;
}

.el-menu {
  border: none;
}

.el-main {
  background-color: #eaedf1;
}
</style>
